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    <script>
        /* 5. 编写函数has(arr , 60) 判断数组中是否存在60这个元素，返回布尔类型*/
        var arr = [1, 2, 3, 60];
        var arr2 = [1, 2, 3];

        function has(n) {
            for (var i = 0; i < arr.lenght; i++) {
                if (arr.indexOf(n) === arr[i]) {
                    return true;
                } else if (arr.indexOf(n) === -1) {
                    return false;
                }
            }
        }
        console.log(has(60)) // true
        console.log(has(arr2, 60)) // false

    </script>
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